R
Virtex-II Platform FPGAs: DC and Switching Characteristics
IOB Output Switching Characteristics Standard Adjustments
Table 17 gives all standard-specific adjustments for output delays terminating at pads, based on standard capacitive load,
C
. Output delays terminating at a pad are specified for LVTTL with 12 mA drive and fast slew rate. For other standards,
REF
adjust the delays by the values shown.
Table 17: IOB Output Switching Characteristics Standard Adjustments
Speed Grade
IOSTANDARD
Timing
Description
LVTTL (Low-Voltage Transistor-Transistor Logic), Slow, 2 mA
LVTTL, Slow, 4 mA
Attribute
Parameter
-6
-5
-4
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
LVTTL_S2
TOLVTTL_S2
TOLVTTL_S4
9.42
5.77
4.11
2.87
2.32
1.70
1.26
6.52
2.80
1.57
0.46
0.00
9.71 10.68
LVTTL_S4
5.95
4.24
2.96
2.39
1.75
1.30
6.72
2.88
1.62
0.48
0.00
6.55
4.66
3.26
2.63
1.93
1.43
7.39
3.17
1.78
0.52
0.00
LVTTL, Slow, 6 mA
LVTTL_S6
TOLVTTL_S6
LVTTL, Slow, 8 mA
LVTTL_S8
TOLVTTL_S8
LVTTL, Slow, 12 mA
LVTTL_S12
TOLVTTL_S12
LVTTL, Slow, 16 mA
LVTTL_S16
TOLVTTL_S16
LVTTL, Slow, 24 mA
LVTTL_S24
TOLVTTL_S24
LVTTL, Fast, 2 mA
LVTTL_F2
TOLVTTL_F2
LVTTL, Fast, 4 mA
LVTTL_F4
TOLVTTL_F4
LVTTL, Fast, 6 mA
LVTTL_F6
TOLVTTL_F6
LVTTL, Fast, 8 mA
LVTTL_F8
TOLVTTL_F8
LVTTL, Fast, 12 mA
LVTTL_F12
TOLVTTL_F12
LVTTL, Fast, 16 mA
LVTTL_F16
TOLVTTL_F16
–0.13 –0.14 –0.15
–0.22 –0.23 –0.26
LVTTL, Fast, 24 mA
LVTTL_F24
TOLVTTL_F24
LVCMOS (Low-Voltage CMOS), 3.3V, Slow, 2 mA
LVCMOS, 3.3V, Slow, 4 mA
LVCMOS, 3.3V, Slow, 6 mA
LVCMOS, 3.3V, Slow, 8 mA
LVCMOS, 3.3V, Slow, 12 mA
LVCMOS, 3.3V, Slow, 16 mA
LVCMOS, 3.3V, Slow, 24 mA
LVCMOS, 3.3V, Fast, 2 mA
LVCMOS, 3.3V, Fast, 4 mA
LVCMOS, 3.3V, Fast, 6 mA
LVCMOS, 3.3V, Fast, 8 mA
LVCMOS, 3.3V, Fast, 12 mA
LVCMOS, 3.3V, Fast, 16 mA
LVCMOS, 3.3V, Fast, 24 mA
LVCMOS, 2.5V, Slow, 2 mA
LVCMOS, 2.5V, Slow, 4 mA
LVCMOS, 2.5V, Slow, 6 mA
LVCMOS, 2.5V, Slow, 8 mA
LVCMOS, 2.5V, Slow, 12 mA
LVCMOS, 2.5V, Slow, 16 mA
LVCMOS, 2.5V, Slow, 24 mA
LVCMOS, 2.5V, Fast, 2 mA
LVCMOS, 2.5V, Fast, 4 mA
LVCMOS, 2.5V, Fast, 6 mA
LVCMOS, 2.5V, Fast, 8 mA
LVCMOS, 2.5V, Fast, 12 mA
LVCMOS33_S2
LVCMOS33_S4
LVCMOS33_S6
LVCMOS33_S8
LVCMOS33_S12
LVCMOS33_S16
LVCMOS33_S24
LVCMOS33_F2
LVCMOS33_F4
LVCMOS33_F6
LVCMOS33_F8
LVCMOS33_F12
LVCMOS33_F16
LVCMOS33_F24
LVCMOS25_S2
LVCMOS25_S4
LVCMOS25_S6
LVCMOS25_S8
LVCMOS25_S12
LVCMOS25_S16
LVCMOS25_S24
LVCMOS25_F2
LVCMOS25_F4
LVCMOS25_F6
LVCMOS25_F8
LVCMOS25_F12
TOLVCMOS33_S2
TOLVCMOS33_S4
TOLVCMOS33_S6
TOLVCMOS33_S8
TOLVCMOS33_S12
TOLVCMOS33_S16
TOLVCMOS33_S24
TOLVCMOS33_F2
TOLVCMOS33_F4
TOLVCMOS33_F6
TOLVCMOS33_F8
TOLVCMOS33_F12
7.67
4.37
3.34
2.29
1.91
1.24
1.18
5.82
2.48
1.28
0.48
0.27
7.91
4.50
3.44
2.36
1.97
1.27
1.22
6.00
2.55
1.31
0.49
0.28
8.70
4.95
3.78
2.60
2.16
1.40
1.34
6.60
2.81
1.45
0.54
0.31
TOLVCMOS33_F16 –0.14 –0.14 –0.15
TOLVCMOS33_F24 –0.21 –0.21 –0.23
TOLVCMOS25_S2
TOLVCMOS25_S4
TOLVCMOS25_S6
TOLVCMOS25_S8
TOLVCMOS25_S12
TOLVCMOS25_S16
TOLVCMOS25_S24
TOLVCMOS25_F2
TOLVCMOS25_F4
TOLVCMOS25_F6
TOLVCMOS25_F8
TOLVCMOS25_F12
9.11
5.00
4.53
3.86
2.84
2.36
2.00
4.06
1.15
0.72
0.33
0.02
9.39 10.33
5.16
4.67
3.98
2.93
2.43
2.06
4.18
1.18
0.74
0.34
0.02
5.67
5.13
4.38
3.22
2.67
2.27
4.60
1.30
0.81
0.37
0.03
DS031-3 (v3.5) November 5, 2007
Product Specification
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